Run the loadtest as it is described here: http://cometd.org/documentation/2.x/howtos/loadtesting. Keep the default values, but make sure that you raise the clients setting to 1000. Run the loadtest until JIT compilation time is close to a value of zero (about 10k calls).

Make sure that the performance results are reasonably fast. On a MacBook Pro i7 2.6ghz dualcore produces the following: